<?php

/**

 * A simple set of functions to check our version 1.0 update service.

 *

 * @package WordPress

 * @since 2.3.0

 */

/**

 * Check WordPress version against the newest version.

 *

 * The WordPress version, PHP version, and Locale is sent. Checks against the

 * WordPress server at api.wordpress.org server. Will only check if WordPress

 * isn't installing.

 *

 * @package WordPress

 * @since 2.3.0

 * @uses $wp_version Used to check against the newest WordPress version.

 *

 * @return mixed Returns null if update is unsupported. Returns false if check is too soon.

 */

function wp_version_check() {

	if ( defined('WP_INSTALLING') )

		return;

	global $wp_version, $wpdb, $wp_local_package;

	$php_version = phpversion();

	$current = get_transient( 'update_core' );

	if ( ! is_object($current) ) {

		$current = new stdClass;

		$current->updates = array();

		$current->version_checked = $wp_version;

	}

	$locale = apply_filters( 'core_version_check_locale', get_locale() );

	// Update last_checked for current to prevent multiple blocking requests if request hangs

	$current->last_checked = time();

	set_transient( 'update_core', $current );

	if ( method_exists( $wpdb, 'db_version' ) )

		$mysql_version = preg_replace('/[^0-9.].*/', '', $wpdb->db_version($wpdb->users));

	else

		$mysql_version = 'N/A';

	$local_package = isset( $wp_local_package )? $wp_local_package : '';

	$url = "http://api.wordpress.org/core/version-check/1.3/?version=$wp_version&php=$php_version&locale=$locale&mysql=$mysql_version&local_package=$local_package";

	$options = array(

		'timeout' => 3,

		'user-agent' => 'WordPress/' . $wp_version . '; ' . get_bloginfo( 'url' )

	);

	$response = wp_remote_get($url, $options);

	if ( is_wp_error( $response ) )

		return false;

	if ( 200 != $response['response']['code'] )

		return false;

	$body = trim( $response['body'] );

	$body = str_replace(array("\r\n", "\r"), "\n", $body);

	$new_options = array();

	foreach( explode( "\n\n", $body ) as $entry) {

		$returns = explode("\n", $entry);

		$new_option = new stdClass();

		$new_option->response = esc_attr( $returns[0] );

		if ( isset( $returns[1] ) )

			$new_option->url = esc_url( $returns[1] );

		if ( isset( $returns[2] ) )

			$new_option->package = esc_url( $returns[2] );

		if ( isset( $returns[3] ) )

			$new_option->current = esc_attr( $returns[3] );

		if ( isset( $returns[4] ) )

			$new_option->locale = esc_attr( $returns[4] );

		$new_options[] = $new_option;

	}

	$updates = new stdClass();

	$updates->updates = $new_options;

	$updates->last_checked = time();

	$updates->version_checked = $wp_version;

	set_transient( 'update_core',  $updates);

}

/**

 * Check plugin versions against the latest versions hosted on WordPress.org.

 *

 * The WordPress version, PHP version, and Locale is sent along with a list of

 * all plugins installed. Checks against the WordPress server at

 * api.wordpress.org. Will only check if WordPress isn't installing.

 *

 * @package WordPress

 * @since 2.3.0

 * @uses $wp_version Used to notidy the WordPress version.

 *

 * @return mixed Returns null if update is unsupported. Returns false if check is too soon.

 */

function wp_update_plugins() {

	global $wp_version;

	if ( defined('WP_INSTALLING') )

		return false;

	// If running blog-side, bail unless we've not checked in the last 12 hours

	if ( !function_exists( 'get_plugins' ) )

		require_once( ABSPATH . 'wp-admin/includes/plugin.php' );

	$plugins = get_plugins();

	$active  = get_option( 'active_plugins' );

	$current = get_transient( 'update_plugins' );

	if ( ! is_object($current) )

		$current = new stdClass;

	$new_option = new stdClass;

	$new_option->last_checked = time();

	$timeout = 'load-plugins.php' == current_filter() ? 3600 : 43200; //Check for updated every 60 minutes if hitting the themes page, Else, check every 12 hours

	$time_not_changed = isset( $current->last_checked ) && $timeout > ( time() - $current->last_checked );

	$plugin_changed = false;

	foreach ( $plugins as $file => $p ) {

		$new_option->checked[ $file ] = $p['Version'];

		if ( !isset( $current->checked[ $file ] ) || strval($current->checked[ $file ]) !== strval($p['Version']) )

			$plugin_changed = true;

	}

	if ( isset ( $current->response ) && is_array( $current->response ) ) {

		foreach ( $current->response as $plugin_file => $update_details ) {

			if ( ! isset($plugins[ $plugin_file ]) ) {

				$plugin_changed = true;

				break;

			}

		}

	}

	// Bail if we've checked in the last 12 hours and if nothing has changed

	if ( $time_not_changed && !$plugin_changed )

		return false;

	// Update last_checked for current to prevent multiple blocking requests if request hangs

	$current->last_checked = time();

	set_transient( 'update_plugins', $current );

	$to_send = (object)compact('plugins', 'active');

	$options = array(

		'timeout' => 3,

		'body' => array( 'plugins' => serialize( $to_send ) ),

		'user-agent' => 'WordPress/' . $wp_version . '; ' . get_bloginfo( 'url' )

	);

	$raw_response = wp_remote_post('http://api.wordpress.org/plugins/update-check/1.0/', $options);

	if ( is_wp_error( $raw_response ) )

		return false;

	if( 200 != $raw_response['response']['code'] )

		return false;

	$response = unserialize( $raw_response['body'] );

	if ( false !== $response )

		$new_option->response = $response;

	else

		$new_option->response = array();

	set_transient( 'update_plugins', $new_option );

}

/**

 * Check theme versions against the latest versions hosted on WordPress.org.

 *

 * A list of all themes installed in sent to WP. Checks against the

 * WordPress server at api.wordpress.org. Will only check if WordPress isn't

 * installing.

 *

 * @package WordPress

 * @since 2.7.0

 * @uses $wp_version Used to notidy the WordPress version.

 *

 * @return mixed Returns null if update is unsupported. Returns false if check is too soon.

 */

function wp_update_themes( ) {

	global $wp_version;

	if( defined( 'WP_INSTALLING' ) )

		return false;

	if( !function_exists( 'get_themes' ) )

		require_once( ABSPATH . 'wp-includes/theme.php' );

	$installed_themes = get_themes( );

	$current_theme = get_transient( 'update_themes' );

	if ( ! is_object($current_theme) )

		$current_theme = new stdClass;

	$new_option = new stdClass;

	$new_option->last_checked = time( );

	$timeout = 'load-themes.php' == current_filter() ? 3600 : 43200; //Check for updated every 60 minutes if hitting the themes page, Else, check every 12 hours

	$time_not_changed = isset( $current_theme->last_checked ) && $timeout > ( time( ) - $current_theme->last_checked );

	if( $time_not_changed )

		return false;

	// Update last_checked for current to prevent multiple blocking requests if request hangs

	$current_theme->last_checked = time();

	set_transient( 'update_themes', $current_theme );

	$current_theme->template = get_option( 'template' );

	$themes = array( );

	$themes['current_theme'] = (array) $current_theme;

	foreach( (array) $installed_themes as $theme_title => $theme ) {

		$themes[$theme['Stylesheet']] = array( );

		foreach( (array) $theme as $key => $value ) {

			$themes[$theme['Stylesheet']][$key] = $value;

		}

	}

	$options = array(

		'timeout'		=> 3,

		'body'			=> array( 'themes' => serialize( $themes ) ),

		'user-agent'	=> 'WordPress/' . $wp_version . '; ' . get_bloginfo( 'url' )

	);

	$raw_response = wp_remote_post( 'http://api.wordpress.org/themes/update-check/1.0/', $options );

	if( is_wp_error( $raw_response ) )

		return false;

	if( 200 != $raw_response['response']['code'] )

		return false;

	$response = unserialize( $raw_response['body'] );

	if( $response )

		$new_option->response = $response;

	set_transient( 'update_themes', $new_option );

}

function _maybe_update_core() {

	global $wp_version;

	$current = get_transient( 'update_core' );

	if ( isset( $current->last_checked ) &&

		43200 > ( time() - $current->last_checked ) &&

		isset( $current->version_checked ) &&

		$current->version_checked == $wp_version )

		return;

	wp_version_check();

}

/**

 * Check the last time plugins were run before checking plugin versions.

 *

 * This might have been backported to WordPress 2.6.1 for performance reasons.

 * This is used for the wp-admin to check only so often instead of every page

 * load.

 *

 * @since 2.7.0

 * @access private

 */

function _maybe_update_plugins() {

	$current = get_transient( 'update_plugins' );

	if ( isset( $current->last_checked ) && 43200 > ( time() - $current->last_checked ) )

		return;

	wp_update_plugins();

}

/**

 * Check themes versions only after a duration of time.

 *

 * This is for performance reasons to make sure that on the theme version

 * checker is not run on every page load.

 *

 * @since 2.7.0

 * @access private

 */

function _maybe_update_themes( ) {

	$current = get_transient( 'update_themes' );

	if( isset( $current->last_checked ) && 43200 > ( time( ) - $current->last_checked ) )

		return;

	wp_update_themes( );

}

add_action( 'admin_init', '_maybe_update_core' );

add_action( 'wp_version_check', 'wp_version_check' );

add_action( 'load-plugins.php', 'wp_update_plugins' );

add_action( 'load-update.php', 'wp_update_plugins' );

add_action( 'admin_init', '_maybe_update_plugins' );

add_action( 'wp_update_plugins', 'wp_update_plugins' );

add_action( 'load-themes.php', 'wp_update_themes' );

add_action( 'load-update.php', 'wp_update_themes' );

add_action( 'admin_init', '_maybe_update_themes' );

add_action( 'wp_update_themes', 'wp_update_themes' );

if ( !wp_next_scheduled('wp_version_check') && !defined('WP_INSTALLING') )

	wp_schedule_event(time(), 'twicedaily', 'wp_version_check');

if ( !wp_next_scheduled('wp_update_plugins') && !defined('WP_INSTALLING') )

	wp_schedule_event(time(), 'twicedaily', 'wp_update_plugins');

if ( !wp_next_scheduled('wp_update_themes') && !defined('WP_INSTALLING') )

	wp_schedule_event(time(), 'twicedaily', 'wp_update_themes');

?>